condition mean min max ZT0-3 10.872783 10.872783 10.872783 ZT4-7 13.720212 13.720212 13.720212 ZT8-11 14.574387 14.574387 14.574387 ZT12-15 14.586042500000001 14.586042500000001 14.586042500000001 ZT16-19 15.849945 15.849945 15.849945 ZT20-23 14.146604499999999 14.146604499999999 14.146604499999999